The most common and most likely answer to this crossword clue is the 9 letter word SYNERGIST
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Buddy explains!
The straight part
We know that "drug" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drug = synergist.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SYNERGIST mean?
SYNERGIST noun- Any synergistic agent.
- (by extension) A chemical compound that increases the chemical activity of another compound when used with it.
- One who holds the religious doctrine of synergism.